JP5074003B2 - Mark detection apparatus, rotary printing machine using the same, and mark detection method - Google Patents

Description

  The present invention relates to a mark detection apparatus, a rotary printing press using the mark detection apparatus, and a mark detection method.

2. Description of the Related Art Conventionally, in a rotary printing machine or the like, for example, as shown in Patent Document 1, when a web is cut in the width direction after printing on the web, the cutting position is set so as not to cause a cutting shift in the web traveling direction. A web cutting control device is provided for controlling the above.
In this method, the cutting position is controlled using a cut mark printed on the web (specifically, a cut register mark, hereinafter also simply referred to as a mark).
Based on a reference pulse from a rotary encoder that rotates in synchronization with the cutter cylinder (saw cylinder) of the folding machine, the mark is detected by the timing at which the web is cut by the saw cylinder and the mark detector attached at a fixed position. The compensator roller is moved in the vertical direction so that the timing coincides with or reaches a predetermined difference.
By moving the compensator up and down, it is possible to finely adjust the web traveling path length and finely adjust the web phase relative to the rotational phase of the saw cylinder, so that the cutting position of the printed matter can be held at a fixed position.

JP 2004-18192 A

By the way, although what is shown by patent document 1 is made to detect a mark, in a rotary printing machine, since the following situations generate | occur | produce, there exists a problem that it cannot be said that it is enough for stable cutting control. is there.
That is, in a rotary printing machine, the web surface is soiled during printing, and there is an unexpected show-through, which may be erroneously recognized as a mark.
Further, when a mark is selected in the pattern portion, if there is a pattern similar to the pattern selected as the mark, the similar pattern may be detected as the mark.
As described above, when cutting control is performed using an erroneously recognized mark, the cutting position is deviated from a predetermined position, so that a printed matter cannot be produced as a product.
In this case, since manual adjustment is performed again, it takes work time and the amount of damaged paper increases accordingly. In addition, complete automation is not possible.
In addition, a mark on the web may not be detected at a predetermined timing due to a change in printing environment or a change in tension applied to the web, and cutting control may not be possible.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a mark detection apparatus and a mark detection method capable of reliably detecting a mark, and a rotary printing press capable of completely automating cutting control, for example. .

In order to solve the above problems, the present invention employs the following means.
In other words, the mark detection device according to the present invention implements a mark detector disposed at a position where a mark on a printed web travels, and detection of the mark by the mark detector within a specific area. And a gate signal generating means for generating a gate signal as described above, a singular condition portion formed upstream and / or downstream in the web travel direction of the mark, and the web travel direction of the mark Detected as the singular condition part when a voltage equal to or lower than the set voltage value, which is a voltage level for detecting a blank portion provided adjacent to a predetermined distance, continues for the length of the blank portion, which is the length of the blank portion. Singular condition determination unit for determining, detection of the mark within the generation period of the gate signal, and the singular condition unit on the upstream side and / or downstream side of the mark A mark detection determining means for determining the detection of the mark by the detection, is provided, wherein the mark detecting judging means, if the mark in the generation period of the gate signal is not detected, the blank head of the singular condition part When it is recognized that the side end portion is deviated from the center of the gate signal in the delay direction of the pattern, the web is moved in the direction in which the travel path length of the web is shortened, and the center of the gate signal is If it is recognized to be out on the pattern of leading direction from the moving direction of the travel path length becomes long web, characterized that you perform the processing as fall within the scope of the gate signal .

According to the mark detection apparatus of the present invention, the mark on the web through which the mark detector passes is detected within the generation period of the gate signal generated by the gate signal generation means.
At this time, separately from the mark detector, the singular condition determining unit detects and determines the singular condition part formed on the upstream side and / or downstream side of the mark in the web traveling direction based on the detection signal of the mark detector. The mark detection determination means determines that the mark is detected when both the detection of the mark within the generation period of the gate signal and the detection of the singular condition portion on the upstream side and / or the downstream side of the mark are detected.
In this way, the mark detection determination means determines the detected mark as a mark when the detection of the mark and the detection of the singular condition portion separately from them are detected as a mark. Even if there is an unexpected show-through or a pattern similar to the pattern selected as the mark, the risk of misidentifying them as a mark can be eliminated, and the mark can be detected reliably.
Thereby, control performed based on the detection of the mark, for example, cutting control, registration adjustment, and the like can be almost completely automatic control.
Therefore, since these controls can be performed in a short time, the amount of lost paper can be reduced.
Also, as the unique condition part formed on the upstream side and / or downstream side of the mark, the brightest part on the web, in other words, the white paper part that most contrasts with the printed mark is used. The part can clearly distinguish the singular condition part in relation to the mark.
Thereby, the singular condition part can be detected with certainty, so that the mark can be detected more reliably.
The blank paper portion basically indicates a portion where printing is not performed, but may be a portion where thin printing is performed.
Therefore, the blank paper part is preferably an unprinted part between the patterns or between the outer sides of the pattern, but is not printed even in the pattern or is printed thinly. If it can be adopted.
Further, the mark detection determination means performs processing such that when the mark is not detected within the generation period of the gate signal, the side edge of the blank section length of the singular condition section detected and determined by the singular condition determination section falls within the gate signal range. Therefore, the side edge portion of the blank sheet length of the singular condition portion falls within the gate signal range.
As a result, the mark located upstream and / or downstream of the singular condition part is drawn into the range of the gate signal, so that the mark detection determination means can reliably detect the mark.
For example, when this mark detection device is used for cutting control, for example, even if the mark on the web is deviated from the generation period of the gate signal due to a change in the printing environment or a change in tension applied to the web, Since the side end portion is processed so as to fall within the range of the gate signal, the mark can be reliably detected. Thereby, since cutting control is possible, the range of automatic control can be increased markedly.
In addition, as a process in which the mark detection determination unit causes the side edge of the blank sheet length to fall within the range of the gate signal, for example, when the mark detection device is used for cutting control, the web travel path length is adjusted. Means.

  Further, in the mark detection apparatus according to the present invention, the mark detection determination means is configured to detect a value of the detection signal that is most determined to be the mark among the detection signals in the generation period of the previous gate signal. Then, a value on the opposite side by a predetermined amount is used as the mark detection threshold value.

In this way, the mark detection determination means performs mark detection for a value that is a predetermined amount opposite to the value of the detection signal that is determined to be the most marked among the detection signals within the previous gate signal generation period. Therefore, the mark detection in the next gate signal can be stably performed.
Thereby, for example, even if there is a variation in shading of the mark, the mark can be detected reliably.
When a blank paper portion is used as the singular condition portion, the signal level between the singular condition portion and the mark is greatly different, so that the mark detection level can be further lowered and the mark can be detected reliably. it can.

  A printing machine according to the present invention includes the mark detection device according to any one of claims 1 to 3.

According to the present invention, since the mark detection device capable of reliably detecting the mark is used, the mark is detected, and control performed based on the mark, for example, cutting control, registration adjustment, etc. is almost completely automatically controlled. can do.
Therefore, since these controls can be performed in a short time, the amount of lost paper can be reduced.

In the mark detection method according to the present invention, a mark detector disposed at a position where a mark on a printed web travels, and detection of the mark by the mark detector is performed in a specific area. A mark detection method comprising: a gate signal generating means for generating a gate signal; wherein a singular condition part is formed upstream and / or downstream of the mark in the web traveling direction, and the mark web traveling When the voltage equal to or lower than the set voltage value, which is a voltage level for detecting a blank paper portion that is provided in the direction adjacent to the predetermined distance, continues for the blank paper portion length that is the length of the blank paper portion, the specific condition portion detection determined, within the generation period of the gate signal, it is determined that the detection of the mark by the detection of detection and the specific condition of the mark, calling of the gate signal When the mark is not detected within a period, the side edge of the length of the blank portion of the singular condition portion is recognized as deviating in the pattern delay direction from the center of the gate signal. Move the web in the direction of shortening the path length, and if it is recognized that the web signal is deviated from the center of the gate signal in the pattern advance direction, move the web in the direction of increasing the travel path length. characterized that you perform the processing as fall within the scope of the gate signal.

According to the mark detection method of the present invention, the mark on the web through which the mark detector passes is detected within the generation period of the gate signal generated by the gate signal generation means.
At this time, separately from the mark detector, the singular condition portion formed upstream and / or downstream in the web traveling direction of the mark is detected and determined based on the detection signal of the mark detector, and within the generation period of the gate signal. If both the detection of the mark and the detection of the singular condition part on the upstream side and / or the downstream side of the mark are both detected, it is determined that the mark is detected.
As described above, in this mark detection method, since the detection of the mark and the detection of the singular condition portion separately from them are determined as the mark, the detected mark is determined as a mark. Even if there is an unexpected show-through or a pattern similar to the pattern selected as the mark, the risk of misidentifying them as a mark can be eliminated, and the mark can be detected reliably.
Thereby, control performed based on the detection of the mark, for example, cutting control, registration adjustment, and the like can be almost completely automatic control.
Therefore, since these controls can be performed in a short time, the amount of lost paper can be reduced.
Further, as the singular condition part formed on the upstream side and / or downstream side of the mark, the brightest part on the web, in other words, the blank part that most contrasts with the printed mark is used. Can be clearly distinguished in relation to the mark.
Thereby, since the detection of the singular condition part can be performed reliably, the mark can be detected more reliably.
The blank paper portion basically indicates a portion where printing is not performed, but may be a portion where thin printing is performed.
Therefore, the blank paper part is preferably an unprinted part between the patterns or between the outer sides of the pattern, but is not printed even in the pattern or is printed thinly. If it can be adopted.
Further, the mark detection determination means performs processing such that when the mark is not detected within the generation period of the gate signal, the side edge of the blank section length of the singular condition section detected and determined by the singular condition determination section falls within the gate signal range. Therefore, the side edge portion of the blank sheet length of the singular condition portion falls within the gate signal range.
As a result, the mark located upstream and / or downstream of the singular condition part is drawn into the range of the gate signal, so that the mark detection determination means can reliably detect the mark.
For example, when this mark detection device is used for cutting control, for example, even if the mark on the web is deviated from the generation period of the gate signal due to a change in the printing environment or a change in tension applied to the web, Since the side end portion is processed so as to fall within the range of the gate signal, the mark can be reliably detected. Thereby, since cutting control is possible, the range of automatic control can be increased markedly.

  Further, in the mark detection method according to the present invention, the detection signal in the generation period of the previous gate signal is on the opposite side to a predetermined amount with respect to the value of the detection signal closest to the mark. The value is used as a threshold value for the mark detection.

As described above, since the detection signal in the generation period of the previous gate signal is set to the mark detection threshold value that is a predetermined amount opposite to the value of the detection signal that is the most marked side, Mark detection in the next gate signal can be stably performed.
Thereby, for example, even if there is a variation in shading of the mark, the mark can be detected reliably.
When a blank paper portion is used as the singular condition portion, the signal level between the singular condition portion and the mark is greatly different, so that the mark detection level can be further lowered and the mark can be detected reliably. it can.

According to the present invention, the singular condition portion formed upstream and / or downstream of the mark in the web traveling direction is detected based on the detection signal of the mark detector separately from the mark detector, and a gate signal is generated. When both the detection of the mark within the period and the detection of the singular condition part on the upstream side and / or the downstream side of the mark are detected together, the mark is determined to be detected, so that the mark can be reliably detected.
Thereby, control performed based on the detection of the mark, for example, cutting control, registration adjustment, and the like can be almost completely automatic control.
Therefore, since these controls can be performed in a short time, the amount of lost paper can be reduced.

A printing machine 1 according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic configuration diagram schematically showing the entirety of a rotary printing press 1 for newspaper printing provided with a mark detection apparatus according to an embodiment of the present invention.
The rotary printing machine 1 includes a plurality of paper feeding devices 3, an infeed unit 5, a printing unit 7, a turn bar row unit 9, and a folding machine 11.

The paper feeding device 3 includes three pairs of arms 17 that rotatably hold a web 15 on which a web 13 is wound in a roll shape, and a paper splicing device (not shown).
When the web 13 is being fed from the web 15 attached to the arm 17a positioned at the paper feed position, the web 15 is waiting for the web 17 being prepared for paper splicing at the arm 17b located at the paper splicing position. .
When the web 13 of the web 15 being fed out decreases, the web 13 of the web 15 waiting is spliced.
In this way, the web 13 is continuously fed from the paper feeding device 3 to the printing unit 7.

The infeed unit 5 includes an infeed drag 19 and a dancer roller 21.
The infeed drag 19 is a part that continuously pulls out the web 13 from the web 15, and is configured to be driven regardless of the movement of the entire printing press. Here, the infeed drag 19 employs a configuration in which the web 13 is sandwiched between rollers.
The dancer roller 21 is a roller that is substantially orthogonal to the traveling direction 14 of the web 13 and is disposed in parallel with the web 13. The dancer roller 21 is elastically supported by an air cylinder (not shown) in the vertical direction (that is, the direction in contact with and away from the running surface of the web 13).
If the tension of the web 13 is weak, the dancer roller 21 is lowered by the air cylinder to increase the tension of the web 13, and if the tension of the web 13 is strong, the dancer roller 21 rises against the air cylinder and decreases the tension of the web 13. It has become.

The printing unit 7 includes a multi-color printing unit 7a having four sets of printing units for performing double-sided four-color printing, and a two-color printing unit 7b having two sets of printing units for performing double-sided two-color printing. Yes.
In the printing unit, a set of a plate cylinder 23 and a blanket cylinder 25 is disposed so as to face each other with the web 13 interposed therebetween so that double-sided printing is possible, and a printing pressure is applied to each other. Plays a function that fits.
A dampening device and an inking device (not shown) are provided on the peripheral surface of each plate cylinder 23. The dampening device supplies dampening water to the printing plate attached around the plate cylinder 23, and the inking device supplies ink to the printing plate.

In the present embodiment, three multi-color printing units 7a and two-color printing units 7b are provided. The multicolor printing unit 7a has two units at one end (left side in FIG. 1) and one unit at the other side (right side in FIG. 1) with the folding machine 11 in between. The two-color printing unit 7b is arranged in parallel on the one side of the folding machine 11 with three units.
Note that the multicolor printing unit 7a and the two-color printing unit 7b are not limited to this, and may be any number and arrangement.
The multi-color printing unit 7a and the two-color printing unit 7b have a width capable of printing four pages of newspapers, and are normally printed with a width of four pages. However, by changing the width of the web 13 and the printing plate, 1 Printing can be performed with an arbitrary width such as a page width, a two-page width, or a three-page width.

Although not shown, an automatic register sensor is provided at each outlet of the multi-color printing unit 7a and the two-color printing unit 7b.
The automatic registration sensor detects the color misregistration amount of each color, and drives the top and bottom register motor (not shown) provided in each plate cylinder 23 according to the detected color misregistration amount to correct the registration of each color. The amount of color shift is made close to zero.

The turn bar row unit 9 includes a turn bar unit 27 and a compensator unit 29.
The turn bar portion 27 includes a slitter 31, a plurality of sets of turn bar devices 33, a guide roller group 35, and a plurality of guide rollers 37.
A plurality of slitters 31 are provided in the vertical direction at the entrance of the turn bar 27, and longitudinally cut the web 13 sent from the multicolor printing unit 7a and the two color printing unit 7b.

A plurality of turn bar devices 33 are provided in the vertical direction. Each turn bar device 33 is inclined at an angle of approximately 45 ° with respect to the traveling direction 14 of the web 13, is configured with a plurality of turn bars arranged in parallel with the web 13, and overlaps one of the longitudinal webs 13 on the other. Alternatively, there is a function of changing the traveling direction 14 of the web 13 to the width direction of the rotary printing press 1.
The guide roller group 35 is a plurality of guide rollers 39 arranged on both sides of the plurality of turn bar devices 33 (only one side may be provided) and having an axis extending in the longitudinal direction of the rotary printing press 1. It is configured.
The plurality of guide rollers 37 are provided at appropriate locations so that the axis extends in the width direction of the rotary printing press 1, and guides each web 13 along a predetermined path.

In FIG. 1, a state is shown in which the web 13 guided to the upper side is overlapped with the one guided to the lower side by shifting the travel route in the width direction by the turn bar device 33. Yes.
The web 13 guided to the top turn bar device 33a is changed in the traveling direction 14 to the width direction of the rotary printing press 1, and the traveling direction is changed by the guide roller 39a in a substantially orthogonal direction (to face downward). Then, the lower guide roller 39b is wound to change the direction so as to go toward the turn bar device 33b, and the travel path is shifted in the width direction by the turn bar device 33b and overlapped with another web 13.
Thus, although an example was shown, the stacking order of the webs 13 is configured to be appropriately adjusted using the turn bar device 33 and the guide roller group 35.

The compensator unit 29 includes a plurality of compensator rollers 41 arranged at intervals in the vertical direction, and a plurality of mark detectors 43 arranged at the exit from each compensator roller 41.
The compensator roller 41 is extended in a direction substantially orthogonal to the traveling direction of the web 13 and is not shown in the figure, for example, by a suitable driving means such as a screw shaft rotated by a motor, a fluid drive cylinder, etc. It is configured to move toward and away from the left and right (in the case of FIG. 1) and change the travel path length of the web 13.
In FIG. 1, the control direction of the compensator roller 41 is the left-right direction, but the direction may be different depending on the arrangement of the compensator roller 41, in other words, the traveling direction 14 of the web 13 (for example, the vertical direction).
In short, it is only necessary to adjust the travel path length of the web 13 by moving the compensator roller 41.

The mark detector 43 is attached in the vicinity of the guide roller downstream in the traveling direction 14 of the compensator roller 41 so that the measuring unit faces the web 13.
The mark detector 43 is composed of a photodiode or the like that detects light, emits light to each traveling web 13, converts the amount of light (luminous intensity) reflected from the web into a voltage, and outputs it as a mark sensor signal 67. It is.

In FIG. 1, a slitter 31, a turn bar device 33, a guide roller 37, a compensator roller 41, and a mark detector 43 are also provided for the web 13 fed from the multicolor printing unit 7a arranged on the right side of the folding machine 11. ing.
In this way, the web 13 that has been longitudinally cut and arranged in a predetermined order in the turn bar row section 9 is sent to the folding machine 11.

The web 13 in the folding machine 11 is fed to the triangular plate 49 while being tensioned by the first paper drawing device 45 and the second paper drawing device 47. The web 13 is folded in half vertically by a triangular plate 49 and then cut at a predetermined position by a saw cylinder 51 through a lead-in roller, a nipping roller, and the like. Then, it is folded and formed into the target signature, and it is carried out outside.
The saw cylinder 51 is configured to cross the web 13 once per rotation.
A rotary encoder 53 that outputs one reference pulse 55 and a clock pulse 57 for each rotation of the saw cylinder 51 is provided at the shaft portion of the saw cylinder 51.

The rotary printing press 1 includes a control unit 63 including a cut-off controller 59 and a mark detection circuit 61.
The cut-off controller 59 controls the cutting position 65 of the web 13 in the saw cylinder 51 to be a predetermined position.
Therefore, the cut-off controller 59 adjusts the travel path length of the web 13 by adjusting the position of each compensator roller 41 so that the deviation between the reference pulse 55 and the detection signal of the mark 69 on the web 13 falls within a predetermined range. To do.
The mark detection circuit 61 detects the mark 69 on the basis of the mark sensor signal 67 from the mark detector 43 and the cut-off controller using a deviation between the reference pulse 55 and the target determined by the plate mark position as a detection signal. 59.

FIG. 2 is a block diagram showing a schematic configuration of the mark detection circuit 61.
FIG. 3 is a schematic diagram showing the relationship between the mark 69, the pattern 71, the cutting position 65, and the like of the web 13.
A pattern 71 is printed on the web 13. In the adjacent pattern 71, a blank portion 73 is provided between the top side pattern 71a located on the downstream side in the traveling direction 14 of the web 13 and the ground side pattern 71b located on the upstream side.
The length L1 of the blank portion 73 in the traveling direction 14 is set to 24 mm, for example.
A predetermined cutting position 65 is set at a substantially central position of the blank portion 73. The top margin L2 from the cutting position 65 to the top pattern 71a is, for example, 11 mm. Further, the ground margin L3 from the cutting position 65 to the ground pattern 71b is, for example, 13 mm.

The mark 69 has a rectangular shape of 1 mm × 10 mm and is smear-printed so as to extend in the width direction so that the distance L4 between the mark 69 and the ground pattern 71b is approximately 2 mm, for example.
Therefore, the black mark 69 shows a marked contrast with the substantially white color of the blank portion 73 and can be clearly distinguished. Note that the substantially white color of the blank portion 73 has the most light reflection, so that the printed mark 69 can be clearly distinguished in any case, so the mark 69 may be printed in an appropriate color.
A margin portion 73 from the mark 69 to the top side pattern 71a is set as a mark downstream margin portion (blank page portion, unique condition portion) 75.
The mark downstream margin 75 as the singular condition portion is set on the downstream side of the mark 69 in the traveling direction 14 of the web 13, but may be set on the upstream side of the mark 69, or on the upstream and downstream sides. It may be set on both sides.

The length along the traveling direction 14 of the mark downstream margin 75, so as to ensure a 20mm as blank manager _{W L} for control, for example, there is a 21 mm.
When the length L1 of the margin portion 73 is long, the interval L4 in the range capable of securing a blank manager W _L is greater. That is, the interval L4 are those determined by the length L1 and blank manager _{W L,} which is usually a 2 to 8 mm.

The mark detection circuit 61 includes a determination circuit 79, a gate generation circuit (gate signal generation means) 81, a mark logic signal generation circuit 83, and a blank page length determination circuit (singular condition determination unit) 85. .
The gate generation circuit 81 introduces the reference pulse 55 and the clock pulse 57 from the rotary encoder 53, and generates a gate signal 87 that rises at a timing determined by the reference pulse 55 and the plate mark position and continues for a predetermined period.

For example, as shown in FIG. 3, the timing is set so that the reference pulse 55 rises, that is, rises from a position of 3 mm upstream from the cutting position 65 in the traveling direction 14 of the web 13. And the generation | occurrence | production period is set so that it may be set to about 21 mm in the length of the web 13, for example.
These timings and generation periods are merely examples, and are appropriately set according to various conditions.

The determination circuit 79 receives the mark sensor signal 67 via the A / D converter 91, and the peak (maximum) voltage value (the value of the detection signal on the side determined to be the most marked) within the rising period of the gate signal 87. ) detects MV _P, a predetermined amount opposite to the 60% of the value of the peak voltage value MV _p, threshold voltage in the start-up period of the next gate signal 87 (Threshold voltage) output (the peak voltage value MV _P (Value, threshold value) MV _P60 .
Accordingly, the high part of the mark logic signal is a candidate for the detection signal of the mark 69.
Note that the threshold voltage output MV _P60 is 60% of the peak voltage value MV _p , but this is an example, and is set to a ratio as necessary.

The mark logic signal generation circuit 83 generates a threshold voltage output (threshold) generated by the mark sensor signal 67, the gate signal 87, and the determination circuit 79 generated continuously by the mark detector 43 and analog-converted by the D / A converter 89. The MV _P60 is received and the mark sensor signal 67 corresponding to the rising period of the gate signal 87 is compared with the threshold voltage output MV _P60 to generate a mark logic signal ML that is a binary signal of a high part and a low part. .

The blank page length determination circuit 85 receives the set voltage value V _L generated by the determination circuit 79 _{, the} blank page length W _L and the mark sensor signal 67 generated continuously by the mark detector 43, and the mark sensor signal 67 is set to the set voltage value. compared to V _L, it is determined whether V _L logic signal to generate a V _L logic signal indicating the lesser portion continues blank Division W _L or more (i.e., whether it is marked downstream margin 75), The result is transmitted to the determination circuit 79.
The set voltage value V _L is set to a low voltage level in order to detect the mark downstream margin 75.

The determination circuit 79 includes a mark detection determination circuit (mark detection determination means) 93. The mark detection determination circuit 93 receives the gate signal 87 of the gate generation circuit 81, the mark logic signal ML of the mark logic generation circuit 83, and the detection determination signal of the mark downstream margin portion 75 of the blank paper length determination circuit 85, as follows. It is determined whether the mark 69 has been detected.
That is, the first rising position of mark logic signal ML (the position exceeding the first threshold voltage output _MVP60 in the rising period of gate signal 87) is set as a mark position candidate.

Then, before the first rising edge position of the mark logic signal ML, continued voltage level below set voltage value V _L is blank director W _L or higher (i.e., there is marked downstream margin 75 prior to mark candidate) Judge that it is.
Next, it is determined that a voltage having a level equal to or lower than the set voltage value V _L continues from the start of the rising period of the gate signal 87 to before the mark candidate.
If all of these are “YES”, it is determined that the mark candidate is the detection of the mark 69, and the position is transmitted to the cut-off controller 59.

The mark detector 43, the rotary encoder 53, and the mark detection circuit 61 mainly constitute the mark detection apparatus of the present invention.
This mark detection device detects a mark 69 used for cutting position control by the cut-off controller 59.

The operation of the mark detection apparatus according to the present embodiment configured as described above will be described together with the printing operation.
First, before the start of printing, the mark detector 43 is moved so as to be positioned at the position in the width direction of the mark 69 as necessary.
Further, the cutoff controller 59 sets a temporary position of the compensator roller 41. For example, if printing has been performed with the same paper thread, the optimum position of the compensator roller 41 recorded at that time is set.
Further, the generation period of the gate signal 87 in the mark detection circuit 61, the set voltage value V _L and the blank paper portion length W _L are set as necessary.

Then, normal printing work is started.
When the rotary printing press 1 is driven, the web 13 is pulled out from the paper feeding unit 3 by the infeed unit 5, adjusted in tension, and conveyed to the printing unit 7.
Initially, if necessary, the web 13 is conveyed at a substantially constant low speed, and preliminary ink supply, paper threading, and the like are performed.
Thereafter, the web 13 is accelerated. While the speed is increased, the printing unit of each of the printing units 7a and 7b performs cylinder insertion, and the image 71 is printed on both surfaces of the web 13 running on the printing unit 7, and the mark 69 is simultaneously printed at a predetermined position. The

The webs 13 printed by the printing units 7a and 7b are conveyed to the turn bar row unit 9.
Each web 13 sent to the turn bar row portion 9 is longitudinally cut by the slitter 31 in the turn bar portion 27. One of the longitudinally cut webs 13 is changed by the turn bar device 33 so that the running direction 14 of the webs 13 is changed to the width direction of the rotary printing press 1 and is superimposed on the other longitudinally cut web.
In addition, a part of the vertically cut web 13 is adjusted in the stacking order using the turn bar device 33 and the guide roller group 35.

Thus, each web 13 in which the stacking order and the position in the width direction are adjusted is wound around the compensator roller 41 of the compensator unit 29, overlapped, and conveyed to the folding machine 11.
Tension is applied by the first paper drawing device 45 and the second paper drawing device 47 and is conveyed to the triangular plate 49. The web 13 is folded vertically by a triangular plate 49 and then cut at a predetermined position in the width direction by a saw cylinder 51 through a lead-in roller, a nipping roller, and the like. Then, it is folded and formed into the target signature, and it is carried outside.

After the cylinder loading, the web 13 is conveyed at a substantially constant medium speed, and an adjustment process for adjusting the color tone and the registration of the web 13 is performed.
At the start of this adjustment process, the cut-off controller 59 starts cutting control.
At this time, the position of the compensator roller 41 is set to an optimum position at the time of printing speed (higher than the medium speed) in the previous work in which the same paper threading was performed.
The tension applied to the web 13 varies depending on the paper quality and basis weight of the web and the paper drawing amount of the paper drawing device. That is, as the paper drawing amount is lower, the tension acting on the web 13 is smaller.

When the tension applied to the web 13 is small, the progress timing of the pattern 71 tends to be delayed as compared with the case where the tension is large.
FIG. 3 shows a state where the cutting position 65 and the gate signal 87 indicated by the solid lines are targets (setting at the printing speed). In the adjustment process at a lower speed than this, since the progress timing of the pattern 71 is delayed, the web 13 has the top side pattern 71a as shown in the cutting position 65a or the cutting position 65b indicated by a two-dot chain line in FIG. It will be cut on the upstream side.

At this time, since the gate signal 87a corresponding to the cutting position 65a does not cover the position of the mark 69, the mark cannot be detected and cutting control by the cut-off controller 59 cannot be performed.
On the other hand, since the gate signal 87b corresponding to the cutting position 65b covers the position of the mark 69, the mark can be detected and the cutting controller 59 can perform cutting control.

Moreover, if the advance timing of the pattern 71 is advanced, the cutting position 65 moves to the upstream side and approaches the ground side pattern 71b. For example, the gate signal 87c corresponding to the cutting position 65c indicated by the two-dot chain line in FIG. 3 covers the position of the mark 69, so that the mark can be detected and cutting control by the cut-off controller 59 can be performed.
However, when the cutting position 65 is closer to the ground side pattern 71b, the gate signal 87 does not cover the position of the mark 69, so that the mark cannot be detected and cutting control by the cut-off controller 59 cannot be performed. .

A specific mark detection operation of the mark detection circuit 61 will be described below with reference to FIGS.
FIG. 4 is a schematic diagram showing the pattern and the state of each signal in a state where the gate signal 87 covers the position of the mark 69. 5 to 10 are schematic diagrams showing the state of each signal when the timing of the gate signal 87 in FIG. 4 changes.

The web 13 is conveyed in the traveling direction 14 and passes through the mark detector 43. That is, if the web 13 is stopped, the mark detector 43 moves along the arrow 95, and the mark sensor signal 67 of the mark detector 43 is generated in the order from the left side to the right side in FIG. Become.
The mark detector 43 emits light to each traveling web 13, converts the amount of light (luminous intensity) reflected from the web 13 into a voltage, and outputs the voltage as a mark sensor signal 67. At this time, the voltage is converted to be smaller as the amount of reflected light is larger. Therefore, the mark sensor signal 67 is lower in a portion without a pattern, and higher in a portion with a pattern, particularly a darker portion.

The mark sensor signal 67 varies depending on the position of the web 13 as shown in FIG.
Since this mark sensor signal 67 is repeatedly printed with the same pattern, a substantially constant variation is repeated. When the same part of the web 13 is extracted, even if there is a detection error, a substantially constant waveform is obtained.
5 to 10 also show the mark sensor signal 67 of the web 13 that is substantially the same as in FIG.

Since the gate signal 87 generated by the gate generation circuit 81 rises at a predetermined timing with respect to the reference pulse 55 of the rotary encoder 53, that is, the cutting position 65, the timing at which the web 13 moves along the traveling direction 14 varies ( If it advances and retreats, the positional relationship of the traveling direction 14 with respect to the web 13 changes.
As a result, the waveform shape of the mark sensor signal 67 corresponding to the rising period of the gate signal 87 varies as shown in FIGS. 5 to 10 sequentially show a process in which the web 13 is shifted to the downstream side from the state in which the web 13 is shifted to the upstream side in the traveling direction 14.

The mark logic signal generation circuit 83 compares the mark sensor signal 67 corresponding to the rising period of the gate signal 87 with the threshold voltage output MV _P60, and is a mark logic signal ML that is a binary signal of a high part and a low part. Is generated.
This threshold voltage output MV _P60 uses what is calculated by the determination circuit 79 as 60% of the peak voltage value MV _p of the mark sensor signal in the previous rise period of the gate signal 87, and therefore the mark logic signal ML is used as the threshold voltage output MV _P60. When generating, the threshold voltage can be changed according to the peak voltage of the immediately preceding mark sensor signal.
Thereby, for example, even if the mark 69 has a variation in shading, the mark 69 can be reliably distributed to a high part of the mark logic signal 69.

The V _L logic signal compares the continuously generated mark sensor signal 67 with the set voltage value V _L set by the determination circuit 79 in the blank page length determination circuit 85, and corresponds to a portion lower than the set voltage value V _L. Is generated.
Since the set voltage value V _L is set at a low voltage level, it is generated at a position corresponding to the blank portion 73. Therefore, the V _L logic signal is generated over a blank manager W _L or longer at a position corresponding to the mark downstream margin 75.

The mark detection determination circuit 93 of the determination circuit 79 includes the gate signal 87 generated by the gate generation circuit 81, the mark logic signal ML generated by the mark logic generation circuit 83, and the mark downstream margin 75 from the blank page length determination circuit 85. A detection determination signal is received, and it is determined whether the mark 69 has been detected.
This determination is a mark position candidates the first rising position 97 of the mark logic signal ML (first condition), before that, V _L logic signals to determine whether to continue blank Division W _L or more (second condition) . Then, it is determined that the _VL logic signal continues from the start of the rising period of the gate signal 87 to before the mark candidate (third condition).
If all of these are “YES”, it is determined that the mark candidate is the detection of the mark 69, and the position is transmitted to the cut-off controller 59.

This determination will be specifically described for the cases of FIGS.
FIG. 5 shows a state in which the web 13 is most shifted to the upstream side in the traveling direction 14 in these cases. The position of the gate signal 87 is substantially the same position as the gate signal 87a of FIG. 3 and does not cover the position of the mark 69.
In this case, the first rising position 97 of the mark logic signal ML exists in the portion located upstream of the top side picture 71a, so the first condition is satisfied. However, the V _L logic signal immediately before the rising position 97 is absent, and, V _L logic signal is present from the start position of the gate signal 87 to the vicinity of the rising position 97. Therefore, since the second and third conditions are not satisfied, the mark detection determination circuit 93 does not determine that the rising position 97 is the detection of the mark 69.

In the generation period of the gate signal 87, since the peak voltage value MV _p of the mark logic signal ML is in the top pattern 71a, the determination circuit 79 uses 60% of the peak voltage value MV _p as the threshold voltage output MV _P60. And is transmitted to the mark logic signal generation circuit 83 for the next generation period of the gate signal 87.
In this case, the threshold voltage output MV _P60 is lower than the mark 69 portion.

In this case, mark detection decision circuit 93 obtains the position (right end in the drawing) the trailing edge of the blank manager W _L position from the nearest gate signal 87, the rear end position of the blank director W _L from the center of the gate signal 87 Recognize that the pattern is deviating in the direction of delay, and perform the pull-in process.
That is, the mark detection determination circuit 93 sends a signal for moving the compensator roller 41 to the cut-off controller 59 in a direction in which the travel path length of the web 13 is shortened in this case, and moves the compensator roller 41 to make a blank sheet. the rear end position of the director W _L is set in a range of gate signal 87.
Accordingly, the tension of the web 13 is gradually increased as the operation progresses, and the tendency of the web 13 to move relatively downstream in the traveling direction 14 can be promoted. Therefore, the time when the mark 69 enters the range of the gate signal 87. Can be made faster.
For this reason, the start of the cutting control by the cut-off controller 59 can be promoted.

FIG. 6 shows a state in which the web 13 has moved relatively downstream in the traveling direction 14 as compared with the case of FIG. 5, and the position of the gate signal 87 covers more than half of the position of the mark 69.
In this case, the first rising position 97 of the mark logic signal ML exists in the portion located upstream of the top picture 71b as in FIG. 5, and therefore the first condition is satisfied. However, the V _L logic signal immediately before the rising position 97 is absent, and, V _L logic signal is present from the start position of the gate signal 87 to the vicinity of the rising position 97. Therefore, since the second and third conditions are not satisfied, the mark detection determination circuit 93 does not determine that the rising position 97 is the detection of the mark 69.

Also at this time, the mark detection determination circuit 93 _obtains the rear end (right end in the drawing) position of the nearest blank page length WL from the position of the gate signal 87, and the rear end position of the blank page length W _L is the center of the gate signal 87. It recognizes that it is deviating in the direction of the delay of the picture from, and performs the pull-in process.
That is, the mark detection determination circuit 93 sends a signal for moving the compensator roller 41 to the cut-off controller 59 in a direction in which the travel path length of the web 13 is shortened in this case, and moves the compensator roller 41 to make a blank sheet. the rear end position of the director W _L is set in a range of gate signal 87.

In the generation period of the gate signal 87, since the peak voltage value MV _p of the mark logic signal ML is in the mark 69 portion, the determination circuit 79 calculates 60% of the peak voltage value MV _p as the threshold voltage output MV _P60. This is transmitted to the mark logic signal generation circuit 83 for the next generation period of the gate signal 87.

FIG. 7 shows a state in which the web 13 has moved to the downstream side in the traveling direction 14 as compared with the case of FIG. The position of the gate signal 87 is located at substantially the same position as the gate signal 87b in FIG. 3, covers the position of the mark 69, and deviates from the high density portion of the top side picture 71a.
In this case, the first rising position 97 of the mark logic signal ML exists at the mark 69, and therefore the first condition is satisfied. Further, since there is a _VL logic signal that continues for the blank portion length W _L or more immediately before the rising position 97, the second condition is also satisfied. However, since the _VL logic signal does not exist at the start position of the gate signal 87, the third condition is not satisfied. Therefore, the mark detection determination circuit 93 does not determine that the rising position 97 is the detection of the mark 69.

In this case, mark detection decision circuit 93 obtains the position (right end in the drawing) the trailing edge of the blank manager W _L position from the nearest gate signal 87, the rear end position of the blank director W _L from the center of the gate signal 87 Recognize that the pattern is deviating in the direction of delay, and perform the pull-in process.
That is, the mark detection determination circuit 93 sends a signal for moving the compensator roller 41 to the cut-off controller 59 in a direction in which the travel path length of the web 13 is shortened in this case, and moves the compensator roller 41 to make a blank sheet. the rear end position of the director W _L is set in a range of gate signal 87.

FIG. 8 shows a state in which the web 13 has moved relatively downstream in the traveling direction 14 as compared with the case of FIG. 7. The position of the gate signal 87 covers the position of the mark 69 and deviates from the top picture 71a.
In this case, the first rising position 97 of the mark logic signal ML exists at the mark 69, and therefore the first condition is satisfied. Further, since there is a _VL logic signal that continues for more than the blank sheet length W _L immediately before the rising position 97, the second condition is satisfied. Furthermore, since the _VL logic signal exists from the start position of the gate signal 87 to the vicinity of the rising position 97, the third condition is satisfied. Therefore, the mark detection determination circuit 93 determines that the rising position 97 is the detection of the mark 69 and transmits the position to the cut-off controller 59.
Thereby, the cut-off control 59 can perform cutting control.

When the mark detection signal is transmitted from the mark detection circuit 61, the cut-off controller 59 calculates a phase shift amount between the mark detection circuit 61 and the target set by the reference pulse signal 55 and the plate mark position. The travel path length of the web 13 is adjusted by adjusting the position of each compensator roller 41 so as to fit.
In this case, the cutoff controller 59 moves the compensator roller 41 in the direction in which the travel path length of the web 13 is shortened.
As a result, the web 13 moves relatively downstream in the traveling direction 14 as compared to the state of FIG.

FIG. 9 shows a state in which the web 13 has moved relatively downstream in the traveling direction 14 as compared with the case of FIG. 8. The position of the gate signal 87 is located at substantially the same position as the gate signal 87c in FIG. 3, and covers the position of the mark 69 and the downstream side position of the ground side picture 71b.
In this case, the first rising position 97 of the mark logic signal ML exists at the mark 69, and therefore the first condition is satisfied. Further, since there is a _VL logic signal that continues for more than the blank sheet length W _L immediately before the rising position 97, the second condition is satisfied. Furthermore, since the _VL logic signal exists from the start position of the gate signal 87 to the vicinity of the rising position 97, the third condition is satisfied.
Therefore, the mark detection determination circuit 93 determines that the rising position 97 is the detection of the mark 69 and transmits the position to the cut-off controller 59.

FIG. 10 shows a state in which the web 13 has moved relatively downstream in the traveling direction 14 as compared with the case of FIG. 9. The position of the gate signal 87 covers the position of the mark 69 and the downstream position of the ground side picture 71b.
In this case, the first rising position 97 of the mark logic signal ML exists at the mark 69, and therefore the first condition is satisfied. Further, since there is a _VL logic signal that continues for the blank portion length W _L or more immediately before the rising position 97, the second condition is also satisfied. However, since the _VL logic signal does not exist at the start position of the gate signal 87, the third condition is not satisfied. Therefore, the mark detection determination circuit 93 does not determine that the rising position 97 is the detection of the mark 69.

At this time, the mark detection judgment circuit 93 _obtains the rear end position of the nearest blank portion length WL from the position of the gate signal 87, and the rear end position of the blank portion length W _L extends from the center of the gate signal 87 in the advance direction of the pattern. Recognize that it is off and perform the pull-in process.
That is, the mark detection determination circuit 93 sends a signal for moving the compensator roller 41 to the cut-off controller 59 in the direction in which the travel path length of the web 13 becomes longer in this case, and moves the compensator roller 41 to move the blank paper. the rear end position of the director W _L is set in a range of gate signal 87.

  Even when the mark signal is slightly deviated from the gate due to, for example, a change in the printing environment or a change in the tension applied to the web, the mark detection determination circuit 93 does not determine that the mark 69 has been detected. Since the mark 69 can be detected, cutting control by the cut-off controller 59 is possible, and the width of automatic control can be greatly increased.

The mark detection determination circuit 93 checks the signal level of the mark sensor signal 67 during the generation period of the gate signal. If the signal level does not exceed the lower limit specified voltage MV _MIN , the above three conditions are satisfied. Even if it is satisfied, the detection signal of the mark 69 is not transmitted to the cutoff controller 59.

In this way, the mark detection determination circuit 93 determines the detected mark as the mark 69 when the detection of the mark 69 and the presence of the _VL logic signal separately from the detection of the mark 69. Even if there are stains, unexpected show-through, or patterns similar to the pattern selected as the mark 69, the risk of misidentifying them as the mark 69 can be eliminated, and the mark 69 can be detected reliably. can do.
Thereby, the cutting control by the cut-off controller 59 performed based on the detection of the mark 69 can be almost completely automatic control.
Therefore, since the cutting control can be performed in a shorter time than that including a manual operation, the amount of damaged paper can be reduced.

  Further, since the mark downstream margin 75 that is not printed most contrasting with the mark 69 is used as the unique condition portion, the level difference in the mark sensor signal between the mark downstream margin 75 and the mark 69 increases. For this reason, for example, since the detection level of the mark 69 can be lowered, the mark 69 can be detected more reliably.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to these Embodiment, It can implement in various deformation | transformation in the range which does not deviate from the meaning of this invention.
For example, in the above-described embodiment, a dedicated cut register mark printed outside the frame that is not the 71 part of the pattern is used as the mark 69, but it corresponds to a mark that is a specific part of the pattern that is regarded as a cut mark, such as an edge part of the pattern A location may be used as the mark 69.

  In the present embodiment, the mark downstream margin 75 that is not printed most contrastingly with the mark 69 is used as the specific condition portion, but this is a portion that is almost unprinted or printed in the pattern 71 portion. A portion may be used.

  The period of the gate signal 87 generated by the gate generation circuit 81 is not particularly limited.

1 is a front view showing a schematic configuration of a rotary printing press using a mark detection apparatus according to an embodiment of the present invention. It is a block diagram which shows schematic structure of the mark detection circuit concerning one Embodiment of this invention. It is a schematic diagram which shows the relationship of the mark concerning one Embodiment of this invention, a pattern, a cutting position, etc. FIG. It is a schematic diagram which shows the state of the pattern and each signal in the state where the gate signal concerning one Embodiment of this invention covers the position of a mark. It is a schematic diagram which shows the state of each signal when the timing of the gate signal concerning one Embodiment of this invention changes. It is a schematic diagram which shows the state of each signal when the timing of the gate signal concerning one Embodiment of this invention changes. It is a schematic diagram which shows the state of each signal when the timing of the gate signal concerning one Embodiment of this invention changes. It is a schematic diagram which shows the state of each signal when the timing of the gate signal concerning one Embodiment of this invention changes. It is a schematic diagram which shows the state of each signal when the timing of the gate signal concerning one Embodiment of this invention changes. It is a schematic diagram which shows the state of each signal when the timing of the gate signal concerning one Embodiment of this invention changes.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary printing machine 13 Web 43 Mark detector 69 Mark 75 Mark downstream margin 81 Gate generation circuit 85 Blank page length judgment circuit 93 Mark detection judgment circuit MV _P60 Threshold voltage output

Claims (5)

A mark detector disposed at a position where a mark on a printed web travels;
Gate signal generation means for generating a gate signal so that the detection of the mark by the mark detector is performed in a specific area;
In a mark detection apparatus comprising:
A singular condition part formed on the upstream side and / or downstream side of the mark in the web running direction;
When a voltage equal to or lower than a set voltage value, which is a voltage level for detecting a blank portion provided adjacent to the mark in the web running direction for a predetermined distance, continues for the blank portion length that is the length of the blank portion. and specificity condition determination section for detecting determined as the singular condition part,
Mark detection determination means for determining detection of the mark by detection of the mark within the generation period of the gate signal and detection of the singular condition part on the upstream side and / or downstream side of the mark , and
When the mark is not detected within the generation period of the gate signal, the mark detection determination means has a side edge portion of the blank section length of the singular condition portion deviated from the center of the gate signal in the pattern delay direction. If the web is moved in the direction in which the travel path length of the web is shortened, and if it is recognized that the web is deviating from the center of the gate signal in the pattern advance direction, the web moving the travel route in the direction in which the length becomes longer, the mark detecting apparatus according to claim and this performing processing as fall within the scope of the gate signal. The mark detection judging means sets a value that is a predetermined amount opposite to a value of the detection signal that is most judged to be the mark among the detection signals in the generation period of the previous gate signal. The mark detection apparatus according to claim 1, wherein a detection threshold value is used. Rotary printing press, characterized in that it comprises a mark detecting apparatus according to claim 1 or claim 2. A mark detector disposed at a position where a mark on a printed web travels;
Gate signal generation means for generating a gate signal so that the detection of the mark by the mark detector is performed in a specific area;
In a mark detection method of a mark detection apparatus comprising:
Forming a singular condition part on the upstream side and / or downstream side in the web running direction of the mark,
When a voltage equal to or lower than a set voltage value, which is a voltage level for detecting a blank portion provided adjacent to the mark in the web running direction for a predetermined distance, continues for the blank portion length that is the length of the blank portion. Detecting and determining as the singular condition part ,
Within the generation period of the gate signal, it is determined that the mark is detected by detecting the mark and detecting the singular condition part ,
When the mark is not detected within the generation period of the gate signal, it is recognized that the side edge portion of the blank section length of the singular condition portion is deviated from the center of the gate signal in the pattern delay direction. If the web is moved in the direction in which the web travel path length is shortened and it is recognized that the web travel path length deviates from the center of the gate signal, the web travel path length is long. is moved to become the direction, the mark detecting method comprising the this performing processing as fall within the scope of the gate signal. The mark detection judging means sets a value that is a predetermined amount opposite to a value of the detection signal that is most judged to be the mark among the detection signals in the generation period of the previous gate signal. The mark detection method according to claim 4, wherein a detection threshold value is used.

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